While it's certainly unscientific to shut out alternate theories based solely on the 'authority' of whatever happens to be the prevailing theory of the period, that doesn't mean that repeating the same arguments rooted in absolute ignorance of the topic can be passed off as unclouded wisdom. You think physicists haven't considered that general relativity could be wrong for the last 100 years? Or that there's some deeply seated ideological tether to Einstein that keeps modern physicists from wanting to one-up him? Anyone who could come up with something that unseats general relativity would be a sure bet for a nobel prize, and put themselves in the history books.
Maybe the sort of posts I'm talking about are actually a vocal minority of repeat offenders, but it's still pretty depressing when the signal to noise ratio here about certain science topics is even worse than a place like Reddit. Probably because most of the people in less "nerdy" communities haven't had a childhood of praise of super intelligence for being able to program the family's VCR and power cycle the cable modem to fix the "broken" internet.